#include <iostream.h>
#include <apmatrix.h>
#include <fstream.h>

enum cellType {black,white};
void recursive (int x,int y,apmatrix <cellType> &table);

void main (void) {
	apmatrix<cellType> table(20,20,white);

	ifstream infile ("digital.txt",ios::in);
	int n = 0;
	infile >> n;
	for (int g = 0;g < n;g++) {
		int y,z;
		infile >> y;infile >> z;
		table[y][z] = black;
	}

	int x=0,y=0;

	do {
		cout << "  ";
		for (int g = 1;g < 10;g++) cout << g;
		for (g = 0;g < 10;g++) cout << g;
		cout << "0\n\n";
		for (int a = 0;a < 20;a++) {
			if (a < 9) cout << a + 1; else if (a < 19) cout << a - 9; else cout << "0";
			cout << " ";
			for (int b = 0;b < 20;b++) if (table[b][a] == black) cout << "*"; else cout << " ";
			cout << "\n";
		}

		cout << "\n\nWhich object to erase? (Enter 2 points, or 21 21 to quit)  --> ";
		
		cin >> x;cin >> y;
		x--;y--;
		if (x < 20 && table[x][y] == black) recursive(x,y,table);
	} while (x < 20);
}

void recursive (int x,int y,apmatrix <cellType> &table) {
	table[x][y] = white;
	if (x + 1 < 20 && table[x+1][y] == black) recursive(x+1,y,table);
	if (x - 1 >= 0 && table[x-1][y] == black) recursive(x-1,y,table);
	if (y + 1 < 20 && table[x][y+1] == black) recursive(x,y+1,table);
	if (y - 1 >= 0 && table[x][y-1] == black) recursive(x,y-1,table);
}